Update README.md

README.md

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-ONNX models available in the `Files and versions` tab
+ONNX models available in the `Files and versions` tab. You need both the .onnx and the .onnx.data files to inference the model.
 
 ## How to convert to ONNX:
 1) download the model from https://github.com/hellozhuo/pidinet#:~:text=vary%20too%20much)%3A-,Model,-ODS